During the mid-1970s, he briefly revived his musical career, releasing the single Play With Fire featuring Marky (soon-to-be Ramone) Bell, Jon Tiven, and Doug Snyder, the EP Screwed Up, album Vampires Stole My Lunch Money and single "Broken Statue". The album featured fellow NME journalist Chrissie Hynde and Dr. Feelgood guitarist Wilko Johnson.

Aside from his own work, he provided lyrics for various musician friends over the years. He collaborated with Lemmy, co-writing "Lost Johnny" for Hawkwind, and "Keep Us on the Road" and "Damage Case" for Motörhead. With Larry Wallis, he co-wrote "When's the Fun Begin?" for the Pink Fairies and several tracks on Wallis' solo album Death in the Guitafternoon. He provided lyrics for the Wayne Kramer single "Get Some" during the mid-1970s, and continued to work with and for him during the 1990s.

During the early 1970s he contributed to the UK Underground press such as the International Times, also establishing Nasty Tales which he successfully defended from an obscenity charge. He later wrote for the mainstream New Musical Express, for which he wrote the article The Titanic Sails At Dawn, an analysis of what he considered the malaise afflicting then-contemporary rock music and which described the conditions that subsequently resulted in punk.[6]

He wrote 23 novels, including the Victor Renquist novels and the DNA Cowboys sequence. His 1989 novel The Armageddon Crazy dealt with a post-2000 United States dominated by fundamentalists who subvert the Constitution. He began writing fantasy literature in the 70s.[4]

Farren organised the Phun City Festival in 1970. He has long been associated with the Hells Angels (UK) who provided security at Phun City; they even awarded Farren an "approval patch" in 1970 for use on his first solo album Mona.